Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 52: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 2 (joint session TT/HL)

TT 52.8: Vortrag

Donnerstag, 19. März 2020, 11:30–11:45, HSZ 03

Diagrammatic Resummation Theory Approach to Few-Photon Scattering and Dynamics in Waveguide QED — •Kiryl Piasotski and Mikhail Pletyukhov — RWTH Aachen University, Germany

In the present talk, the diagrammatic resummation theory approach to the problems of multi-photon scattering and dynamics in the single-qubit waveguide QED is presented. It is shown that within the rotating wave approximation, irrespectively of the number of radiation channels, dispersion of the modes they are supporting, and the nature of the radiation-qubit coupling, the determination of both scattering and dynamical observables in the subspace of the fixed excitation number, is reducible to a solution of the closed finite system of linear integral equations. Further, the above described theoretical machinery is showcased on the number of problems regarding the systems with delayed coherent quantum feedback, namely it is shown how the formalism could be applied to determine the coherence functions of radiation within the scattering setup, as well as the determination of certain dynamical characteristics of non-Markovian waveguide QED systems.